STRATIGRAPHY OF OHIO WAVERLY FORMATIONS 679 



THE GRANVILLE SHALE FACIES 



Extent and thickness. — This facies lies between the Toboso and 

 Hocking Valley conglomerate facies and is an area in which shales 

 accumulated to a much greater extent than in the other two. It is 

 of unusual interest because it was in the Licking County outcrops 

 of this facies that Herrick worked out certain of his faunal horizons 

 and from which he described many species; furthermore the 

 succession of formations found there, as interpreted by the workers 

 of the time, has been adopted during the past decade as the typical 

 Waverly column of Ohio. 



The boundaries of the facies are only partially determined and 

 must be largely inferred at present. In general it appears to 

 occupy most of the eastern half of Fairfield and the western part 

 of Perry counties, where it is almost entirely below drainage, and 

 the central part of southern Licking County. The Toboso con- 

 glomerate area lies to the eastward in Licking County and, pre- 

 sumably, also in Perry County, but deep under cover in the latter. 

 The Hocking Valley conglomerate area lies to the westward in 

 central Fairfield County, and its hypothetical northward extension 

 in northern Fairfield and western Licking counties, since removed, 

 is supposed to have limited the Granville province in that direction. 

 To the southeastward, it is partially limited by the small con- 

 glomerate lobe on the eastern side of the Hocking Valley area, and 

 it probably does not extend much farther in that direction under 

 the Coal Measures cover before it is bounded by coarse sediments 

 extending continuously from the Toboso to the Hocking Valley 

 facies. It has not been traced to the northward and northwest- 

 ward, but it probably extends across the northern part of Licking 

 County and somewhere in that direction it formerly united with the 

 shale deposits of the Cuyahoga which, from theoretical considera- 

 tions, must have extended around the northern end of the Hocking 

 Valley conglomerate facies and must have been continuous with 

 the shales of the Scioto Valley shale facies. 



Unfortunately the three northern townships of Fairfield County 

 are almost without exception very heavily drift covered, a buried 

 pre-glacial valley; the northwestern portion of Perry County, al- 

 though underlain by rock, shows very few outcrops, and at the 



